Regional Surface Waves from Mesabi Range Mine Blasts (Northern Minnesota)
Abstract
The surface waves from mine blasts recorded on the Central Minnesota Seismic Array were analyzed for propagation characteristics and velocities. The seismic array was a six station vertical array with a diameter of 28 kilometers. It was located in east central Minnesota and was emplaced in 1976 to monitor local seismicity. It routinely recorded mine blasts which occurred in the Mesabi Range of northern Minnesota, about 200 kilometers from the array. The surface wave train is complex, with at least two distinguishable phases consistently present. The overall wave train is characteristic of the Lg phase, but the dominant surface wave arrival is interpreted as Rg. The Rg phase, also referred to as R1, and a later surface wave arrival (R2) were analyzed to determine the effects of regional and local geology on the surface wave velocities and raypaths. Most of the data were analyzed through the use of two signal processing techniques, multiple filter analysis and cross-correlation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 29, 1991
- Accession Number
- ADA258725
Entities
People
- Carolan Laudon
- Frederick Schult
Organizations
- University of Minnesota